package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

@Service
public class EmployeeServiceImpl implements EmployeeService {
    @Value("${default.admin.password}")
    private String defaultPassword;
    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // 对密码进行MD5加密处理
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO 新员工信息
     * @return
     */
    public void addEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();

        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);
        employee.setPassword(DigestUtils.md5DigestAsHex(defaultPassword.getBytes()));
        employee.setStatus(StatusConstant.ENABLE);
        employeeMapper.save(employee);
    }

    /**
     * 分页查询员工信息
     * @param employeePageQueryDTO 前端查询请求
     * @return 返回分页结果
     */
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO.getName());
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 修改员工状态
     * @param status 员工状态 0禁用 1正常
     * @param id 员工id
     * @return
     */
    public void changeStatus(Long id, Integer status) {
        Employee employee = Employee.builder()
                .id(id)
                .status(status)
                .build();
        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工
     * @param id 员工id
     * @return 员工信息
     */
    public Employee selectById(Long id) {
        return employeeMapper.selectById(id);
    }

    /**
     * 修改员工信息
     * @param employeeDTO 修改员工信息
     * @return
     */
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        employeeMapper.update(employee);
    }

    /**
     * 根据id修改员工密码
     * @param passwordEditDTO 新密码信息
     * @return
     */
    public void updatePassword(PasswordEditDTO passwordEditDTO) {
        Employee employee = employeeMapper.selectById(BaseContext.getCurrentId());
        if (employee.getPassword().equals(DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes()))) {
            Employee newEmployee = Employee.builder()
                    .id(BaseContext.getCurrentId())
                    .password(DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes()))
                    .build();
            employeeMapper.update(newEmployee);
        } else {
            throw new PasswordEditFailedException(MessageConstant.PASSWORD_EDIT_FAILED);
        }
    }
}
